fluttergram/lib/edit_profile_page.dart

import "package:flutter/material.dart";
import 'dart:async';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'main.dart'; //for currentuser & google signin instance
import 'models/user.dart';
import 'package:shared_preferences/shared_preferences.dart';

class EditProfilePage extends StatelessWidget {
  TextEditingController nameController = new TextEditingController();
  TextEditingController bioController = new TextEditingController();

  changeProfilePhoto(BuildContext Context) {
    return showDialog(
      context: Context,
      builder: (BuildContext context) {
        return new AlertDialog(
          title: new Text('Change Photo'),
          content: new SingleChildScrollView(
            child: new ListBody(
              children: <Widget>[
                new Text(
                    'Changing your profile photo has not been implemented yet'),
              ],
            ),
          ),
        );
      },
    );
  }

  applyChanges() {
    Firestore.instance
        .collection('insta_users')
        .document(currentUserModel.id)
        .updateData({
      "displayName": nameController.text,
      "bio": bioController.text,
    });
  }

  Widget buildTextField({String name, TextEditingController controller}) {
    return new Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        new Padding(
          padding: const EdgeInsets.only(top: 12.0),
          child: Text(
            name,
            style: new TextStyle(color: Colors.grey),
          ),
        ),
        new TextField(
          controller: controller,
          decoration: new InputDecoration(
            hintText: name,
          ),
        ),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return new FutureBuilder(
        future: Firestore.instance
            .collection('insta_users')
            .document(currentUserModel.id)
            .get(),
        builder: (context, snapshot) {
          if (!snapshot.hasData)
            return new Container(
                alignment: FractionalOffset.center,
                child: new CircularProgressIndicator());

          User user = new User.fromDocument(snapshot.data);

          nameController.text = user.displayName;
          bioController.text = user.bio;

          return new Column(
            children: <Widget>[
              new Padding(
                padding: const EdgeInsets.only(top: 16.0, bottom: 8.0),
                child: new CircleAvatar(
                  backgroundImage: NetworkImage(currentUserModel.photoUrl),
                  radius: 50.0,
                ),
              ),
              new FlatButton(
                  onPressed: () {
                    changeProfilePhoto(context);
                  },
                  child: new Text(
                    "Change Photo",
                    style: const TextStyle(
                        color: Colors.blue,
                        fontSize: 20.0,
                        fontWeight: FontWeight.bold),
                  )),
              new Padding(
                padding: const EdgeInsets.all(16.0),
                child: new Column(
                  children: <Widget>[
                    buildTextField(name: "Name", controller: nameController),
                    buildTextField(name: "Bio", controller: bioController),
                  ],
                ),
              ),
              new Padding(
                padding: const EdgeInsets.all(16.0),
                child: new MaterialButton(
                    onPressed: () => {_logout(context)},
                    child: new Text("Logout")

                )
              )
            ],
          );
        });
  }

  void _logout(BuildContext context) async {
    print("logout");
    await auth.signOut();
    await googleSignIn.signOut();

    SharedPreferences prefs = await SharedPreferences.getInstance();
    await prefs.clear();

    currentUserModel = null;

    Navigator.pop(context);
  }
}